/Engine/Source/Runtime/Engine/Classes/Materials/MaterialExpressionSubsurfaceMediumMaterialOutput.h
Material output expression for setting the mean free path and scattering distribution properties of subsurface profile (for the Path Tracer Only).
class UMaterialExpressionSubsurfaceMediumMaterialOutput : public [UMaterialExpressionCustomOutput](API\Runtime\Engine\Materials\UMaterialExpressionCustomOutput)
FExpressionInpu...
MeanFreePath
Input for mean free path (cm).
FExpressionInpu...
ScatteringDistribution
Input for scattering distribution. Valid range is (-1, 1). Fallback to zero if not set